[mailcatcher] Add pkg-config dependency #12502

Job	Run time
test (apache2)	18s
test (approvals)	9m 39s
test (bibdata)	12s
test (bibdata_sqs_poller)	14s
test (bind9)	17s
test (blacklight_app)	14s
test (byzantine)	14s
test (cantaloupe)	13s
test (capistrano)	17s
test (common)	18s
test (composer)	17s
test (datadog)	17s
test (deploy_user)	12s
test (dpul)	13s
test (drupal10)	13s
test (drush)	14s
test (ealapps)	10m 32s
test (extra_path)	14s
test (ezproxy)	14s
test (ffmpeg)	13s
test (figgy)	17s
test (figgy_filewatcher_worker)	14s
test (figgy_pubsub_worker)	17s
test (fits)	13s
test (freetds)	13s
test (geaccirc)	18s
test (gitlab)	18s
test (hr_share)	24s
test (imagemagick)	13s
test (kakadu)	17s
test (lae)	8m 33s
test (lib_jobs)	9m 49s
test (lib_svn)	13s
test (libwww)	17s
test (lockers_and_study_spaces)	7m 59s
test (mailcatcher)	5m 34s
test (mediainfo)	28s
test (memcached)	12s
test (mflux)	14s
test (mysql)	13s
test (nfsserver)	13s
test (nginx)	15s
test (nginxplus)	22s
test (nodejs)	17s
test (oawaiver)	14s
test (ojs)	14s
test (orangelight)	17s
test (passenger)	5m 39s
test (php)	14s
test (postfix)	14s
test (postgresql)	17s
test (pul_nomad)	14s
test (pulmap)	14s
test (rails_app)	12s
test (redis)	13s
test (researchdata)	8m 58s
test (ruby_s)	5m 9s
test (samba)	14s
test (shared_data)	14s
test (sidekiq_worker)	18s
test (simple_annotation)	17s
test (sneakers_worker)	13s
test (special_collections)	12s
test (subversion)	14s
test (svn)	14s
test (timezone)	18s
test (tippecanoe)	14s
test (towerdeploy)	5m 59s
test (ufw_firewall)	18s
test (video_reserves)	7m 1s
test (vips)	14s
	1h 40m 7s

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